#include <iostream>
#include <string>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <cstring>
#include <unistd.h>


void Usage(std::string proc)
{
    std::cout << "Usage\n\t" << proc << " local_ip local_port\n" << std::endl;
}

int main(int argc, char* argv[])
{
    if(argc != 3)
    {
        Usage(argv[0]);
        exit(1);
    }

    //tcp client 要不要bind（要）? 要不要显示bind（不要）？
    std::string serverip = argv[1];
    uint16_t serverport = std::stoi(argv[2]);

    int sockfd = ::socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0)
    {
        std::cerr << "socket error" << std::endl;
        exit(2);
    }

    struct sockaddr_in server;
    //构建目标主机socket信息
    memset(&server, 0, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(serverport);
    server.sin_addr.s_addr = inet_addr(serverip.c_str());
    // 发起连接
    int n = connect(sockfd, (const struct sockaddr*)&server, sizeof(server));
    if (n < 0)
    {
        std::cerr << "connect error" << std::endl;
        exit(3);
    }

    //进行通信
    while (true)
    {
        std::cout << "Please Enter# ";
        std::string outstring;
        std::getline(std::cin, outstring);

        ssize_t s = send(sockfd, outstring.c_str(), outstring.size(), 0);
        if (s > 0)
        {   
            char inbuffer[1024];
            ssize_t m = recv(sockfd, inbuffer, sizeof(inbuffer) - 1, 0);
            if (m > 0)
            {
                inbuffer[m] = 0;
                std::cout << inbuffer << std::endl;
            }
            else
            {
                std::cerr << "recv error" << std::endl;
                break;
            }

        }
        else 
        {
            std::cerr << "send error" << std::endl;
            break;
        }
    }
    ::close(sockfd);
    return 0;
}